drivers/gpu/drm/armada/armada_fbdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Russell King
   4  *  Written from the i915 driver.
   5  */
   6
   7 #include <linux/errno.h>
   8 #include <linux/fb.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11
  12 #include <drm/drm_crtc_helper.h>
  13 #include <drm/drm_drv.h>
  14 #include <drm/drm_fb_helper.h>
  15 #include <drm/drm_fourcc.h>
  16
  17 #include "armada_crtc.h"
  18 #include "armada_drm.h"
  19 #include "armada_fb.h"
  20 #include "armada_gem.h"
  21
  22 static void armada_fbdev_fb_destroy(struct fb_info *info)
  23 {
  24         struct drm_fb_helper *fbh = info->par;
  25
  26         drm_fb_helper_fini(fbh);
  27
  28         fbh->fb->funcs->destroy(fbh->fb);
  29
  30         drm_client_release(&fbh->client);
  31         drm_fb_helper_unprepare(fbh);
  32         kfree(fbh);
  33 }
  34
  35 static const struct fb_ops armada_fb_ops = {
  36         .owner          = THIS_MODULE,
  37         FB_DEFAULT_IO_OPS,
  38         DRM_FB_HELPER_DEFAULT_OPS,
  39         .fb_destroy     = armada_fbdev_fb_destroy,
  40 };
  41
  42 static int armada_fbdev_create(struct drm_fb_helper *fbh,
  43         struct drm_fb_helper_surface_size *sizes)
  44 {
  45         struct drm_device *dev = fbh->dev;
  46         struct drm_mode_fb_cmd2 mode;
  47         struct armada_framebuffer *dfb;
  48         struct armada_gem_object *obj;
  49         struct fb_info *info;
  50         int size, ret;
  51         void *ptr;
  52
  53         memset(&mode, 0, sizeof(mode));
  54         mode.width = sizes->surface_width;
  55         mode.height = sizes->surface_height;
  56         mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp);
  57         mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  58                                         sizes->surface_depth);
  59
  60         size = mode.pitches[0] * mode.height;
  61         obj = armada_gem_alloc_private_object(dev, size);
  62         if (!obj) {
  63                 DRM_ERROR("failed to allocate fb memory\n");
  64                 return -ENOMEM;
  65         }
  66
  67         ret = armada_gem_linear_back(dev, obj);
  68         if (ret) {
  69                 drm_gem_object_put(&obj->obj);
  70                 return ret;
  71         }
  72
  73         ptr = armada_gem_map_object(dev, obj);
  74         if (!ptr) {
  75                 drm_gem_object_put(&obj->obj);
  76                 return -ENOMEM;
  77         }
  78
  79         dfb = armada_framebuffer_create(dev, &mode, obj);
  80
  81         /*
  82          * A reference is now held by the framebuffer object if
  83          * successful, otherwise this drops the ref for the error path.
  84          */
  85         drm_gem_object_put(&obj->obj);
  86
  87         if (IS_ERR(dfb))
  88                 return PTR_ERR(dfb);
  89
  90         info = drm_fb_helper_alloc_info(fbh);
  91         if (IS_ERR(info)) {
  92                 ret = PTR_ERR(info);
  93                 goto err_fballoc;
  94         }
  95
  96         info->fbops = &armada_fb_ops;
  97         info->fix.smem_start = obj->phys_addr;
  98         info->fix.smem_len = obj->obj.size;
  99         info->screen_size = obj->obj.size;
 100         info->screen_base = ptr;
 101         fbh->fb = &dfb->fb;
 102
 103         drm_fb_helper_fill_info(info, fbh, sizes);
 104
 105         DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n",
 106                 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8,
 107                 (unsigned long long)obj->phys_addr);
 108
 109         return 0;
 110
 111  err_fballoc:
 112         dfb->fb.funcs->destroy(&dfb->fb);
 113         return ret;
 114 }
 115
 116 static int armada_fb_probe(struct drm_fb_helper *fbh,
 117         struct drm_fb_helper_surface_size *sizes)
 118 {
 119         int ret = 0;
 120
 121         if (!fbh->fb) {
 122                 ret = armada_fbdev_create(fbh, sizes);
 123                 if (ret == 0)
 124                         ret = 1;
 125         }
 126         return ret;
 127 }
 128
 129 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = {
 130         .fb_probe       = armada_fb_probe,
 131 };
 132
 133 /*
 134  * Fbdev client and struct drm_client_funcs
 135  */
 136
 137 static void armada_fbdev_client_unregister(struct drm_client_dev *client)
 138 {
 139         struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
 140
 141         if (fbh->info) {
 142                 drm_fb_helper_unregister_info(fbh);
 143         } else {
 144                 drm_client_release(&fbh->client);
 145                 drm_fb_helper_unprepare(fbh);
 146                 kfree(fbh);
 147         }
 148 }
 149
 150 static int armada_fbdev_client_restore(struct drm_client_dev *client)
 151 {
 152         drm_fb_helper_lastclose(client->dev);
 153
 154         return 0;
 155 }
 156
 157 static int armada_fbdev_client_hotplug(struct drm_client_dev *client)
 158 {
 159         struct drm_fb_helper *fbh = drm_fb_helper_from_client(client);
 160         struct drm_device *dev = client->dev;
 161         int ret;
 162
 163         if (dev->fb_helper)
 164                 return drm_fb_helper_hotplug_event(dev->fb_helper);
 165
 166         ret = drm_fb_helper_init(dev, fbh);
 167         if (ret)
 168                 goto err_drm_err;
 169
 170         if (!drm_drv_uses_atomic_modeset(dev))
 171                 drm_helper_disable_unused_functions(dev);
 172
 173         ret = drm_fb_helper_initial_config(fbh);
 174         if (ret)
 175                 goto err_drm_fb_helper_fini;
 176
 177         return 0;
 178
 179 err_drm_fb_helper_fini:
 180         drm_fb_helper_fini(fbh);
 181 err_drm_err:
 182         drm_err(dev, "armada: Failed to setup fbdev emulation (ret=%d)\n", ret);
 183         return ret;
 184 }
 185
 186 static const struct drm_client_funcs armada_fbdev_client_funcs = {
 187         .owner          = THIS_MODULE,
 188         .unregister     = armada_fbdev_client_unregister,
 189         .restore        = armada_fbdev_client_restore,
 190         .hotplug        = armada_fbdev_client_hotplug,
 191 };
 192
 193 void armada_fbdev_setup(struct drm_device *dev)
 194 {
 195         struct drm_fb_helper *fbh;
 196         int ret;
 197
 198         drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
 199         drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
 200
 201         fbh = kzalloc(sizeof(*fbh), GFP_KERNEL);
 202         if (!fbh)
 203                 return;
 204         drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs);
 205
 206         ret = drm_client_init(dev, &fbh->client, "fbdev", &armada_fbdev_client_funcs);
 207         if (ret) {
 208                 drm_err(dev, "Failed to register client: %d\n", ret);
 209                 goto err_drm_client_init;
 210         }
 211
 212         drm_client_register(&fbh->client);
 213
 214         return;
 215
 216 err_drm_client_init:
 217         drm_fb_helper_unprepare(fbh);
 218         kfree(fbh);
 219         return;
 220 }